John martin



(No Model!) J. MARTIN.

MEANS FOR SUPPLYING HOT AIR T0 FURNACES. 7 No, 598,798. Patented Pe,b. 8, 1898.

PAT NT rrrcn.

JOHN MARTIN, OF MELBOURNE, VICTORIA.

MEANS FOR SUPPLYING HOT AIR TO FURNACES.

SPECIFICATION forming part of Letters Patent No. 598,798, dated February 8, 1898.

Application filed June 9,1897. Serial No. 640,039. (N0 model.)

To a whom it may concern..-

Be it known that 1, JOHN MARTIN, a subject of the Queen of Great Britain, residing atMelbourne, in the British Colony of Victoria, have invented certain new and useful Improvementsin Boiler-Furnaces, of which the following is a full, clear, and exact specification.

This invention relates to the supply of hot air to furnaces of all kinds, but more particular1y to the furnaces of locomotive, stationary, and marine boilers.

The object of my invention is to effect a considerable saving of the fuel used in all kinds of boiler and other furnaces, at the same time insuring a complete combustion of such fuel, as well as producing an intense heat from such combustion. This object is accomplished in the manner and by the means hereinafter described and claimed, reference being made to the accompanying drawing, in which the figure is a longitudinal central sectional view showing my invention applied to a boiler-furnace.

In order to enable those skilled in the art to make and use my invention, I will now describe the same in detail, referring to the drawing, wherein- The letter A indicates a blowpipe arranged within the flue of the boiler and having its outer extremity in communication with the atmosphere, while its inner extremity opens into a bulbous chamber 0, constructed with air-jet orifices E for the delivery of hot air from the interior of the bulbous chamber to the products of combustion. The blowpipe A is also constructed near its outer extremity-that is to say, that extremity which is in open communication with the atmosphere-- with a closed bulbous chamber H, in which the hot air can expand after passing through a portion of the blowpipe. The bulbous chamber A, having the hot-air-jet orifices, as before explained, is connected by a sleeve B, outside of and concentric with the blowpipe, with a bulbous chamber D, located approximately centrally between the bulbous chambers (J and II. The bulbous chamber D is provided with air-jet orifices F for the delivery of jets of air onto the products of combustion as they pass to the escape-flue.

The bulbous chamber 0, as shown, is provided with a short length of tube G, leading through the bridge-wall to the chamber under the grate-bars for a supply of some hot air beneath the combustion-chamber.

It will be observed that the jet-orifices in the bulbous chambers G and D deliver the hot airtangentially into the fine in which the blowpipe is located. This tangential delivery is advantageous in that combustion is promoted and a rapid whirling action is created, by which the heating-surfaces throughout the flue are rapidly heated and the fine ash-grit that is deposited in the flue ismore effectually carried along out of the way.

The bulbous chambers described and shown constitute, in effect, baffie-plates located at intervals along the length of the blowpipe, and the hot-air-jet orifices E and F are located near the periphery of such baffle-plates to deliver the hot air tangentially to the flue, as before stated.

WVhen using the above-described arrangement, the space in the main body of the furnace will serve as a retort as well as a combustion-chamber, while the space in the flue between the two bulbs or enlargements C D forms a second and true combustion-chambe1a The arrows in the diagrams show the direction of the hot-air currents and jets at the various points of discharge, those issuing from the peripheries of the bulbs or enlargements O and D being preferably directed tangentially around the inside of the fine, so as to set up a whirling motion of the air and products of combustion therein and thus insure a greater heating effect and more complete combustion.

The extent of active combustion in the furnace and in the combustion-chambers isv controlled and regulated by the quantity of hot air admitted into each of them.

Having thus described my invention, what I claim is 1. The combination with a furnace, of a hot-air blowpipe located therein, and having its outer extremity in communication with the atmosphere, and baffle-plates located at intervals along the length of said pipe and constructed with hot-air orifices which deliver the hot air tangentially into the line in which the blowpipe is arranged, substantially as and for the purposes described.

2. The combination with the flue of a boiler- Ice.

furnace, of a bloWpipe extending into said in communication With the atmosphere, and flue and having its outer end in communicabulbous chambers located upon said pipe, retion with the atmosphere, and bulbous chamceiving the hot air therefor, and constructed bers arranged upon said pipe and communinear their peripheries with hot-air-jet orifices,

5 eating therewith and constructed With hotsubstantially as and for the purposes de- I5 air-jet orifices, substantially as and for the scribed. purposes described. JOHN MARTIN.

3. The combination with the flue of a boiler- Witnesses: furnace, of a hot-air blowpipe extending into EDWARD WATERS, IO the said flue and having its outer extremity EDWARD WATERS, J unr. 

